We took a spin yesterday in the Ford HySeries Edge, the world's first working plug-in, fuel-cell, hydrogen-powered car, which the Detroit automaker plans to show off as a concept at the New York auto show tomorrow. Though wafting zero-emissions exhaust in our face taught us plenty as to the realities of a hydrogen-powered automotive experience, what really made our test special was actually being able to drive a car running on advanced hydrogen fuel-cell technology that can power itself with a 336-volt battery pack.